WORKS OF PROF. J. R JOHNSON PUBLISHED BY JOHN WILEY & SONS. Tbeory and Practice In the Dejignlng of Modern Pram** Structures. A standard work on this subject for both school and office. Quarto, cloth, 520 pages, 450 cuts, 44 full page plates, $10.00. Tha Theory and Practice of Surveying. Designed for the use of Surveyors and Engineers ally, but especially for the use of Students in 7" ing. 8vo, cloth, $4.00. Stadia and'Earth-work Tables. Including Pour-place Logarithms, Logarithmic Traverse Table, Natural Functions, Map Projections, etc. 8vo, cloth, $1.35. The riaterials of Construction. Large 8vo, 800 pages, 650 illustrations, si plates, complete index, $6,00. A treatise for Engineers on the Strength of Engineering Materials.